Improvement in coffee-mills



T. STROBRIDGE.

COFFEE-MILL.

No. 174,026, Patented Feb. 22,1876.

H IIEEEES.

N. FEIERS, PHOTO-LITHOGRAPHER, WASHINGTON, 04 C.

TURNER sTRoBaI eaYoF NEW BRIGHTON, PENNSYLVANIA,

IMPROVEMENT m ooFFEE-MuLs.

Specification forming part of Letters Patent No. 174,026, dated February 22, 1876; application filed ,Deeember. 22, 1875.

bodying my invention. Fig. 2 is a detached view ot' the grinding-shell; and Fig. 3 is a View of the hearing or tightening bar and its detachable step. Like letters refer to like parts wherever they occur.

My invention relates to that class of mills employed for grinding coffee, spices, &c.; and it consists, first, in forming the upper portion of the grinding'shell with a downwardly-projecting flange for completing the base of the hopper and giving a finish to the mill between the hopper and box secondly, in tapping a thread in the end of the bearing-bar and combining with the bar a thumb-screw or similar device, so that the grinding-nut may be adjusted by means of the bar and from the exterior of the box thirdly, in providing a stepping-piece for the grinding nut or spindle thereof, to obviate the wear of the hearing or stepping bar and spindle.

1 will now proceed to describe my invention so thatothers skilled in the art may make and use the same. I

In the drawing, A indicates the box upon which is secured the mill, the top of the box being cut for that purpose. B is the grinding-shell, having a flange, b, or similar means for securing -it to box A, and b the arch for centering and steadying theshank of the grinding-nut, The flange b, after extending outso as to form an annular seat for the hop per, and to give space for the passage of binding-screws which secure the hopper and shell to'box A, is turned downward, as at 0, so as to rest upon the top of the box, and as it extends from the hopper to the box it hides the binding-screws and gives a finished appearance to the mill. 1) indicates the hopper, which rests on the curved seat formed by the flange b or the upper edge of the grindingshell B.

E is the grinding nut, provided with the usual shank E, which passesthrough thearch b, and F is the crank, secured to shank E in any suitable manner. 7

Instead of the tightening-nut commonly employed for adjusting the grinding-nut, I make use,of a bearing or'tightening bar, G, in the ends of which are the holes g, tapped or threaded, so that the end of the bearing-bar forms the nut of a thumb-screw or bolt, the head of which projects above the cover of box A, as at 9. By these devices the grinding-nut may be tightened from the exterior of the box, and the screws, acting on the bar itself, will raise it equally in a horizontal position Without liability of the bar rocking or becoming cranked. In order to be able to tap the ends of the tightening barG, the bar must be of a softer metal than the grinding-nut, which is of chilled cast-iron, and, as a consequence, were the spindle of the grinding-nut stepped directly on the bar, the wear of the parts would destroy the adjusting devices. To obviate this, I form the-barG with a'depression, e, for the reception of a stepping piece or button, 8, of the same material as the grinding-nut, and step the spindle of the grinding-nut directly on this intermediate piece instead of on the bar.

The downWardly-projecting flange 0 may project directly from the upper edge of the' correspondiugly-elongated grinding-shell B, if preferred, instead of being a continuation of flange b, as shown in the drawing, in which case the hopper would rest on the upper'edge of the grinding-shell, instead of upon the seat formed by the upper face of flangeb. The

stepping or adjusting bar may be pivoted at:

one side, if preferred. I

The advantages arising from my lnvention are: First, that by forming the downwardlyprojecting flange upon the grinding-shell, I

avoid the difliculties that have to be encountered in casting the hopper and its base in one,

and the multiplication of parts and trouble of fitting andsetting up consequent npon'castin g a collar orbase-ring separate from the hopper and grinding-shell. I also produce a "-'--griniding-shell which may be used with Bri-.

tanniaor other than cast hoppers. by tapping a thread in the end of thebearing Secondly,

or stepping bar and employing the threaded bolt or thumb-screw, I avoid the difficulty of adj'nstingthe bar within-the box, in fitting up and tightening theinill; and, finally, by the separate stepping-piece or button, I overcome unequal wear of the spindle and bearing-bar, and render the mill more durable.

Having thus described my invention, what claim, and I desire to secure by Letters Patent,

l. The grinding-shell provided with the downwardly-projecting flange b, substantially as and for the purpose specified.

2. In combination with the grinding-nut and washer or step-piece, a' hearing or adjusting bar'tapped at the end, and a thumbscrew or threadedbolt, substantially as and for the purpose specified.

3. ln coinbination with the grinding-nut and bearing or adjustable bar, the step-piece or detachable button, substantially as and for the purpose specified.

In testimony whereof I, the said TURNER STROBRIDGE, have hereunto set my hand.

TURNER STROBRIDGE.

Witnesses:

GEO. GRAHAM, G. W. GLASS. 

